python - 添加效果使语音听起来像通过电话

Question

我知道当一个人通过电话讲话时，由于所使用的麦克风/ channel /扬声器的频率响应不同，他的声音听起来会有些不同。

我一直在研究 Python 中的语音信号处理。我想知道如何模拟这种效果。我需要设计过滤器吗？

Answer 1

这是代码。适合我:

from scipy.signal import lfilter, butter
from scipy.io.wavfile import read,write
from numpy import array, int16
import sys

def butter_params(low_freq, high_freq, fs, order=5):
    nyq = 0.5 * fs
    low = low_freq / nyq
    high = high_freq / nyq
    b, a = butter(order, [low, high], btype='band')
    return b, a

def butter_bandpass_filter(data, low_freq, high_freq, fs, order=5):
    b, a = butter_params(low_freq, high_freq, fs, order=order)
    y = lfilter(b, a, data)
    return y

if __name__ == '__main__':
    fs,audio = read(sys.argv[1])
    low_freq = 300.0
    high_freq = 3000.0
    filtered_signal = butter_bandpass_filter(audio, low_freq, high_freq, fs, order=6)
    fname = sys.argv[1].split('.wav')[0] + '_moded.wav'
    write(fname,fs,array(filtered_signal,dtype=int16))